analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height cpc
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ID: 137816
2009
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Abstract
We measured the size distribution of atmospheric neutral and charged clusters and particles down to mobility diameter around 1.5 nm by applying pulse-height CPC technique at SMEAR II station in Hyytiälä, southern Finland during spring 2007 and May 2008. The concentration of molecular clusters smaller than 3 nm seems to be highly variable in boreal forest environment, the concentration varied typically between 500–50 000 cm<sup>−3</sup>. By comparing to concentrations measured with ion spectrometers, we conclude that ion clusters and neutral clusters produced by ion-ion recombination are usually not sufficient to explain all of the observed clusters; the median fraction of recombination products from all neutral clusters was 4.9%. Before and during most new particle formation events the cluster formation rate rose only slightly, or remained close to stable. Nocturnal formation of clusters was also frequently observed.
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lehtipalo2009atmosphericanalysis
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| Authors | ;K. Lehtipalo;M. Sipilä;I. Riipinen;T. Nieminen;M. Kulmala |
| Journal | Journal of agricultural and food chemistry |
| Year | 2009 |
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